地球上

• It will arrive at the earth with less frequency than a brother photon emitted on the earth .
  它到达地球时的频率小于在地球上发射的同种光子的频率。
• Without such systems the lunar explorers would still be spinning in simulators on earth .
  如没有此种系统，月球探险者至今仍在地球上的模拟器中旋转。
• The evolution of life on earth, or of human society, is a unique historical process .
  地球上的生命进化或者人类社会的进化，只是一个单独的历史过程。
• The largest landmass is usually divided into two continents along the ural mountains .
  习惯上说，地球上最大的一块陆地是沿着乌拉尔山脉分为两大洲的。
• We have ridded the earth of his shadow and liberated its peoples from his yoke .
  我们把他的影子从地球上消除尽净，把世界上的人民从他的压迫下解放出来。
• Our older mountain ranges are gradually being worn away and their mass redistributed over the earth .
  古老的山脉正在逐渐磨损，其质量重新分布在地球上。
• A close look would be likely to suggest that the car is the most conspicuous type of life on earth .
  稍近些观察，也许会以为汽车是地球上最明显的一种生命。
• Paleontologists have studied them since they began to document the history of life on earth .
  古生物学家们一开始论述地球上的生物发展史时就接触到这个问题。
• Now man not only littered the earth, but also has left a number of metal products on the moon .
  现在人类不仅在地球上乱扔东西，而且在月球上也留下一些金属制品。
• At the low temperatures prevailing on the earth, most of the elements have combined to form compounds .
  在地球上通常为低温的情况下，大多数元素已结合成化合物。